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5.2 Wood consumption
Jøtul C 620 has a nominal heat output of ca. 8 kW. Use of
wood, with nominal heat emission: Approx. 2,46 kg/h. The
size of the logs should be:
Kindling:
Length: 20-30 cm
Diameter: 6-10 cm
Amount per fi re: 3 pieces
Firewood (split logs):
Length: Ca 24-30 cm
Intervals for adding wood: Approximately every 49 minutes
Size of the fi re: 1,92 kg (nominal effi ciency)
Amount per load: 3 pieces
The given testresults have been obtained by loading 3 logs á
24 cm, total weight of 1,92 kg.The logs are laid in a triangle.
Ignition vent set for about 63% air, and air vent set for about
75% air.
5.3 Use
•
Open the air vent and the ignition vent by pulling them out
all the way. If necessary, keep the door slightly open. (Use
a glove, for example, as the handle can become hot.)
•
Place two medium sized logs in/out on each side of the
base. N.B. In order to avoid sooting on the glass, it is
important that the log is not placed adjacent to the glass
on the product.
•
Put 2-3 briquettes (or birch bark) between these and add
some kindling wood in a criss-cross pattern on top and
light the newspaper.
•
Gradually increase the size of the woodlogs.
•
Finally, place a medium-sized log on the top of the pile.
•
Then regulate the rate of combustion to the desired level of
heating by adjusting the air vent.
•
Close the stove door. It must always be closed when the
fi re is lit.
Fig. 35
Adding fi rewood
Stoke the stove frequently but only add small amounts of fuel
at a time. If the stove is fi lled too full, the heat created may
cause extreme stress in the chimney. Add fuel to the fi re in
moderation. Avoid smouldering fi res as this produces the most
pollution. The fi re is best when it is burning well and the smoke
from the chimney is almost invisible.
18
Danger of overheating
The fi replace must never be used in a manner that causes
overheating.
Overheating occurs when there is too much fuel and/or too
much air so that too much heat develops. A sure sign of
overheating is when parts of the fi replace glow red. If this
happens, reduce the air vent opening immediately.
Seek professional advice if you suspect that the chimney is
not drawing properly (too much/too little draught). For further
information, see «4.0 Installation» (Chimney and fl ue
Condensation
Condensation in a fi replace / fl ue pipe / chimney may occur.
This may be caused by moist fi rewood or diff erences in
temperature in the fi replace and environment.
Condensed water coming from the fi replace appears as a
black, tar-like liquid. This should be wiped off immediately
to avoid discoloration of the fi replace, fl oor or surrounding
building components.
It is important to get the wood burning quickly to avoid
condensation
.
If the condensation continues, mineral sand can be placed on
the bottom plate.
5.4 How wind and weather aff ect the
stove
The performance of the stove can be aff ected considerably by
the wind acting on the chimney at diff erent strengths. It may
therefore be necessary to adjust the air supply to ensure good
combustion performance.
Fog and mist can have a signifi cant impact on the chimney
draught and it might be necessary to use other combustion air
settings to ensure good performance.
5.4 The importance of the chimney
The chimney is the engine that drives the fi replace and it's
essential to have a good chimney in order for the fi replace
to function properly.
The draught in the chimney creates a vacuum in the stove.
The combustion air is also used for the airwash system that
keeps the window clear of soot.
The draught in the chimney is caused by the diff erence in
temperatures inside and outside the chimney. The greater
the temperature diff erence, the better the draught in the
chimney. It is therefore important to allow the chimney to reach
operating temperature before adjusting the air vents to restrict
combustion in the stove (a brickwork chimney takes longer to
reach operating temperature than a steel chimney).
It is particularly important to reach operating temperature
as quickly as possible on days on which the draught in the
chimney is poor due to unfavourable wind and weather
conditions. Make sure the fuel ignites as quickly as possible.
pipe).
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